When i was driving down the interstate my RPM went down to zero and i could not accelorate, the power steering also cut out. When i turned it back on it started just fine. after about 30 miles of driving on the highway, It acted up again, doing the same thing. After the second time it took a while to get it started again so when it started i turned around and took it to the nearest auto shop. they hooked it up to a diagnostic thing and it showed no codes. I had my security system disabled about three months ago and my fuel line checked as well. Not sure what the problem is.